2. Mettler Toledo
  3. 4E NPT Conductivity/Resistivity Sensors Thornton Instruments

Mettler Toledo 4E NPT Conductivity/Resistivity Sensors Thornton Instruments Operating instructions

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INSTRUCTION MANUAL
234/244 SERIES CONDUCTIVITY SENSORS
The 234/244 Series conductivity sensors are intended for accurate conductivity measurement in
industrial on-line applications.
Typical Installation Read this first Not Recommended
Recommended Mounting
INLET
OUTLET
This is the ideal mounting
position
The sensor should be
mounted so that the
piping does not trap air or
solids.
INLET
AIR
SOLIDS
OUTLET OUTLET
I
NLET
OUTLET
Vertical mounting is
possible, if the pipe is full
and air is not trapped.
INLET
OUTLET
AIR
INLET
OUTLET
Mount the sensor in a
vertical pipe with the flow
direction up. Mettler-
Toledo Thornton, Inc. does
not recommend mounting
the sensor in a vertical
pipe with the flow
direction down, because
air bubbles or air pockets
will affect the sensor
measurement.
INLET
OUTLET
OM84345-D
The printing on each sensor label gives the following information (e.g.):
234/244 Series Conductivity
→ Type designation (244 Series Shown)
Cell M: 0.2500
→ Calibrated cell constant
Temp. M: 1.0003
→ Calibrated temperature constant
Serial No.: 200017
→ Traceable serial number
Order No.: 244-631
→ Order number
Sensor Maintenance
Note: Contaminated sensors can give inaccurate high or low readings, depending upon
the type and location of contaminant accumulation. Both the electrodes and the
insulating surfaces must be cleaned to ensure accurate readings.
If contamination is suspected, removed the cell from its fitting and clean the electrodes and
insulator. When cleaning, use a cotton swab saturated with a mild detergent or a very
diluted (0.5% or less) inorganic acid, i.e. HCl (Hydrochloric Acid), H
2
SO
4
(Sulfuric Acid),
HNO
3
(Nitric Acid). If cleaning with acid use standard acid handling safety procedures.
Rinse thoroughly with distilled or deoinized water before installation. Avoid touching the
cleaned surfaces because oil from your hands will recontaminate the sensor.
(244 Series Sensor Shown.)
DO NOT USE ABRASIVE MATERIALS such as steel wool or nylon scrubbers, these
may harm the electrode surface and could affect the accuracy.
Mettler-Toledo Thornton, Inc. Toll-Free: 800-510-PURE
36 Middlesex Turnpike Fax: 781-271-0214
Bedford, MA 01730 [email protected]
(781) 301-8600
www.thorntoninc.com
OM84345 Rev. D 11/03
/